As far as I know there is NO special category called "Marriage leave" like Maternity Leave, Sick leave etc. Atleast in govt. and/or quasi govt. establishments there is no such leave either for giving credit or debiting the leave a/c. Atbest the concerned are eligible to utilise their own EL/PL/CL for this purpose. There is a possibility some pvt.sector offices may have such a policy, though there is no compulsions.